1. Institute for Diagnostic and Interventional Radiology, Hannover Medical School, Hannover, Germany
2. HealthTwiSt GmbH, Berlin, Germany
3. Department of Interventional Radiology, Klinikum rechts der Isar of the Technical University of Munich, Germany
4. Clinic of Diagnostic and Interventional Radiology, Saarland University Medical Center, Homburg, Germany